Tenjo Tenge is a manga by "Oh! great", which has really beautiful art, and some interesting characters. It's definitely a shonen manga aimed at boys (there is a lot of gratuitous nudity) however, it has some pretty interesting characters and some great fight scenes. It's currently up to it's 12th volume in Japan, and is serialized monthly in Ultra Jump.
12 Volumes of Tenjo Tenge have been released in Japan. Volume 13 is probably due out soon, since enough chapters have been serialized in Ultra Jump to warrant it.
Girls, swords, and panties. What more could you want? Tenjyou Tenge is a bit risque, so be sure that you don't mind that sort of thing before downloading.